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Comment by q3k | Hacker News Reader

And yet he pipes from ls...

And all those functions wrapping [[, ugh.

maybe I should start doing this in Python

    def plus (a,b):
        return a+b

What is wrong with piping `ls`?

It's usually redundant. for i in * <--> for i in `ls`

Usually it is more pristine (from a theoretical standpoint) to use filename generation, aka globbing. You don't need a subprocess.